[llvm] [TwoAddressInstruction] Recompute live intervals for partial defs (PR #74431)

[Jay Foad via llvm-commits]

jayfoad wrote:

An idea for testing this: you could add an `-early-live-intervals` RUN line to some or all of the existing codegen tests that would be fixed by this patch. I think they are:
```
  LLVM :: CodeGen/AMDGPU/GlobalISel/add.vni16.ll
  LLVM :: CodeGen/AMDGPU/ds_gws_align.ll
  LLVM :: CodeGen/AMDGPU/llvm.amdgcn.image.atomic.dim.ll
  LLVM :: CodeGen/AMDGPU/llvm.amdgcn.image.dim.gfx90a.ll
  LLVM :: CodeGen/AMDGPU/llvm.amdgcn.image.sample.dim.gfx90a.ll
```

https://github.com/llvm/llvm-project/pull/74431